Dynamic forms with context-sensitive labels

Summary:

I am currently working on a dynamic form for one of our customers. The form itself was easy to make with the example provided in the documentation. Some fields are used more than once in the form, but with a slightly different label for the input field. I was wondering how I can make this label-input change, based on the choice that is used to dynamically create the form.

Content (required):

My php-skills and javascipt-skills are average, but I do not see a way to dynamically change the label-input field, when a certain selection is done.

My form is triggered by a custom input/SelectionInput field.